Where does “thatness” come from?

thatness (English) comes from English þat, from Middle English þat, from Old English þæt, from Proto-Germanic þat, from Proto-Indo-European tód, from Proto-Indo-European to-, from Proto-Indo-European só — this; that.

thatness (English): The quality or characteristic of being that

Definitions

  1. The quality or characteristic of being that

Ancestry of “thatness”, step by step

thatness traces back through two separate lines of ancestry.

via English þat

StepLanguageWordMeaning
1Englishþatso, so that, in order that
2Middle EnglishþatAlternative form of that
3Old Englishþætnominative/accusative neuter singular of se: the;...
4Proto-Germanicþatnominative/accusative singular neuter of *sa
5Proto-Indo-Europeantóddemonstrative pronoun; that; it
6Proto-Indo-Europeanto-it; that; the, that
7Proto-Indo-Europeanthis; that

via English Ness

StepLanguageWordMeaning
1EnglishNessAn Ulster princess and the mother of Conchobar mac Nessa and Findchoem in the Ulster Cycle of Irish mythology. Daughter of Eochaid Sálbuide. Also the mother of Cormac Cond Longas by incest with Conchobar mac Nessa
2Middle Englishnesse
3Old Englishnæsnot, not at all; not; first/third-person singular...
4Proto-Germanicnasjąfoothill; headland; cape
5Proto-Indo-Europeannéh₂snose
Every word from Proto-Indo-European Every word from Proto-Indo-European to-Every word from Proto-Indo-European tód
thatness — Etymology, Origin & Word History | Etymology Explorer